{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-u2j995pr","versions":[{"created_at":"2026-06-30T19:37:01Z","element_count":83,"note":"5軸GA polish 45->95 by M5 (autonomous)","saved_by":"mcp","sha256":"3b66e97c442c264b0e72bb512d3a618e465ea06a0a8da3b64f4506f16b0c8fcf","version":3},{"created_at":"2026-06-30T19:29:32Z","element_count":122,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1533162de7aa8b91737cd2e21d06985cfb4f28366a146240114bf76e17dfd8ef","version":2},{"created_at":"2026-06-30T19:29:32Z","element_count":122,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}